A search for the direct detection of dark matter via annual modulation with the full XMASS-I dataset
<p>Astrophysical observations indicate that the observable matter that forms the stars, planets and life as we know it only constitutes 5% to the total energy density of our universe. Dark matter and dark energy make up the remainder, 26% and 69% respectively. While the nature of dark energy i...
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| Format: | Thesis |
| Language: | English |
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2021
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| _version_ | 1826299361702707200 |
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| author | Mason, A |
| author2 | Wark, D |
| author_facet | Wark, D Mason, A |
| author_sort | Mason, A |
| collection | OXFORD |
| description | <p>Astrophysical observations indicate that the observable matter that forms the stars, planets and life as we know it only constitutes 5% to the total energy density of our universe. Dark matter and dark energy make up the remainder, 26% and 69% respectively. While the nature of dark energy is still largely speculative, gravitational effects of dark matter have been widely observed and place constraints on its nature. Many candidates that could form dark matter have been ruled out over the years due to the lack of astrophysical signatures they would imply or lack of production, annihilation and direct detection signals in experiments or instruments that have sensitivity for these signals.</p>
<p>XMASS is a single-phase dark matter direct detection experiment. The detector houses 832 kg of liquid Xenon within its active volume and has been operational for over 5 years (the current longest for any noble liquid experiment), resulting in a 3.53 ton year exposure. Two annual modulation analyses are presented in this thesis, one based on the previous XMASS modulation analysis and then my own one that introduces a new classification technique and a new approach to χ<sup>2</sup> minimisation that is less reliant on Monte Carlo based evaluation of systematic uncertainty. The obtained 90% confidence level upper limit for the spin independent interaction cross section (σ <sup>90%</sup><sub>SI</sub>) between Weakly Interacting Massive Particle (WIMP) dark matter and standard model nucleons has been halved to 3.6 × 10<sup>-39</sup> cm<sup>2</sup> for a WIMP of mass 4 GeV with respect to the previous XMASS modulation analysis and has a minimal value of 1.2 × 10<sup>-43</sup> cm<sup>2</sup> for a WIMP of mass 40 GeV.</p> |
| first_indexed | 2024-03-07T05:00:48Z |
| format | Thesis |
| id | oxford-uuid:d8372a12-8abd-43dd-b9de-017eb0a284a8 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:00:48Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | oxford-uuid:d8372a12-8abd-43dd-b9de-017eb0a284a82022-03-27T08:46:42ZA search for the direct detection of dark matter via annual modulation with the full XMASS-I datasetThesishttp://purl.org/coar/resource_type/c_db06uuid:d8372a12-8abd-43dd-b9de-017eb0a284a8PhysicsDark MatterParticle PhysicsEnglishHyrax Deposit2021Mason, AWark, DMartens, K<p>Astrophysical observations indicate that the observable matter that forms the stars, planets and life as we know it only constitutes 5% to the total energy density of our universe. Dark matter and dark energy make up the remainder, 26% and 69% respectively. While the nature of dark energy is still largely speculative, gravitational effects of dark matter have been widely observed and place constraints on its nature. Many candidates that could form dark matter have been ruled out over the years due to the lack of astrophysical signatures they would imply or lack of production, annihilation and direct detection signals in experiments or instruments that have sensitivity for these signals.</p> <p>XMASS is a single-phase dark matter direct detection experiment. The detector houses 832 kg of liquid Xenon within its active volume and has been operational for over 5 years (the current longest for any noble liquid experiment), resulting in a 3.53 ton year exposure. Two annual modulation analyses are presented in this thesis, one based on the previous XMASS modulation analysis and then my own one that introduces a new classification technique and a new approach to χ<sup>2</sup> minimisation that is less reliant on Monte Carlo based evaluation of systematic uncertainty. The obtained 90% confidence level upper limit for the spin independent interaction cross section (σ <sup>90%</sup><sub>SI</sub>) between Weakly Interacting Massive Particle (WIMP) dark matter and standard model nucleons has been halved to 3.6 × 10<sup>-39</sup> cm<sup>2</sup> for a WIMP of mass 4 GeV with respect to the previous XMASS modulation analysis and has a minimal value of 1.2 × 10<sup>-43</sup> cm<sup>2</sup> for a WIMP of mass 40 GeV.</p> |
| spellingShingle | Physics Dark Matter Particle Physics Mason, A A search for the direct detection of dark matter via annual modulation with the full XMASS-I dataset |
| title | A search for the direct detection of dark matter via annual modulation with the full XMASS-I dataset |
| title_full | A search for the direct detection of dark matter via annual modulation with the full XMASS-I dataset |
| title_fullStr | A search for the direct detection of dark matter via annual modulation with the full XMASS-I dataset |
| title_full_unstemmed | A search for the direct detection of dark matter via annual modulation with the full XMASS-I dataset |
| title_short | A search for the direct detection of dark matter via annual modulation with the full XMASS-I dataset |
| title_sort | search for the direct detection of dark matter via annual modulation with the full xmass i dataset |
| topic | Physics Dark Matter Particle Physics |
| work_keys_str_mv | AT masona asearchforthedirectdetectionofdarkmatterviaannualmodulationwiththefullxmassidataset AT masona searchforthedirectdetectionofdarkmatterviaannualmodulationwiththefullxmassidataset |